When Michael storms into Thortex and demands to see Hower, he is wearing light-colored shoes. Shortly after when he sneaks up to the 2nd floor, he is wearing dark/black shoes. When leaving the building with the Devon Miles imposter, he is wearing the light color shoes again.
The "laser" device scanning Devon has a series of sequential lights in the barrel. The lights move slower in Devon's closeups than in the rest of the scene.
KITT says the bomb is mercury- weighted, meaning the liquid metal would complete a circuit and detonate the bomb if moved. As such, Michael violently pulling it from the wall and ripping out its wiring would have set off the bomb.
The emergency braking system would not be able to raise a panel on the roof as KITT has T-Tops that are made from glass.
When KITT's convertible mode is first revealed, we get a good look at the dashboard. Most of KITT's displays and buttons are seen to be cardboard cutouts or white tape.
When the juggernaut is finished smashing K.I.T.T., the T-Tops are missing and the car is now a hard top, including the passenger roof bent almost halfway through. If it were glass t-tops, it would have been busted not bent.
It's quite obvious that Michael, from inside the car, is violently throwing himself in KITT when supposedly attacked by the Juggernaut, and that KITT is not moving at all.
In the scene where K.I.T.T. "buttons up" his Super-Pursuit-Mode gadgetry just before the final showdown with the armored vehicle, only one of K.I.T.T.'s two tiny front "stabilizer fins" is shown retracting; footage of the same fin sliding back in is just shown twice; we never see the other fin retract.
When the vault is broken into, a teardrop shaped rotary beacon mounted on the wall goes off. This type of rotary beacon is usually only found on emergency vehicles.
There are no mountains or hills in Chicago. The background of airstrip in final scene is not possible. The script says they are on airstrip near the loop. Meigs Field existed at the time of production. Three sides were surrounded by Lake Michigan, no hills, no wide open grounds, and no smoke stacks.